Week 3

1.
INPUT Devices
Sumesh Koyon

2.
Objectives Overview
Define input and differentiate
among a program, command, and
user response
Identify the keys and buttons
commonly found on desktop
computer keyboards, and
describe how keyboards for
mobile computers and devices
differ from desktop computer
keyboards
Describe different mouse types
and explain how to use a mouse
Describe various types of touch
screens and explain how a touchsensitive pad works
Describe various types of pen
input, and identify other types of
input for smart phones
Summarize the purpose of various
game controllers
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3.
Objectives Overview
Explain how resolution
affects the quality of a
picture captured on a
digital camera
Describe the uses of
voice recognition,
Web cams, and video
conferencing
Discuss how various
scanners and reading
devices work
Summarize the various
biometric devices
Discuss how POS
terminals, automated
teller machines, and
DVD kiosks work
Identify alternative
input devices for
physically challenged
users
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4.
What Is Input?
• Input is any data and instructions entered into the
memory of a computer
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5.
What Is Input?
• Instructions can be entered into the computer in the
form of programs, commands, and user responses
A program is a series of related
instructions that tells a computer what
tasks to perform and how to perform
them
Programs respond to commands that a
user issues
A user response is an instruction a user
issues by replying to a question
displayed by a program
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6.
What Are Input Devices
An input device
is any hardware
component that
allows users to
enter data and
instructions into
a computer
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7.
The Keyboard
• A keyboard is an input device that contains keys
users press to enter data and instructions into a
computer
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8.
The Keyboard
• Most desktop computer keyboards have…
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9.
The Keyboard
• The insertion point, also known as the cursor, is a
symbol on the screen that indicates where the
next character you type will appear
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12.
The Keyboard
• An ergonomic keyboard has a design that reduces
the chance of wrist and hand injuries
• Ergonomics incorporates comfort, efficiency, and
safety into the design of the workplace
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13.
The Keyboard
• Keyboards on mobile devices typically are smaller
and/or have fewer keys
• Some phones have predictive text input, which
saves time when entering text using the phone’s
keypad
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15.
Mouse
• A mouse is a pointing device that fits under the
palm of your hand comfortably
– Most widely used pointing device on desktop
computers
• A mouse can be wired or wireless
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17.
• A touchpad is
a small, flat,
rectangular
pointing
device that is
sensitive to
pressure and
motion
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Pointing Stick
• A trackball is a
stationary
pointing
device with a
ball on its top
or side
Touchpad
Trackball
Other Pointing Devices
• A pointing
stick is a
pressuresensitive
pointing
device shaped
like a pencil
eraser that is
positioned
between keys
on a keyboard
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18.
Touch Screens and Touch-Sensitive Pads
• A touch screen is a touch-sensitive display device
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22.
Game Controllers
• Video games and computer games use a game controller
as the input device that directs movements and actions
of on-screen objects
Gamepads
Joysticks and
Wheels
Dance pads
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Light guns
Motionsensing
controllers
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24.
Digital Cameras
• A digital camera is a mobile device that allows
users to take pictures and store them digitally
Studio cameras
Field cameras
Point-and-shoot camera
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26.
Digital Cameras
• Two factors affect the quality of digital camera photos:
Resolution
Number of bits
stored in each
pixel
• Resolution is the number of horizontal
and vertical pictures in a display device
• A pixel is the smallest element in an
electronic display
• Each pixel consists of one or more bits of
data
• The more bits used to represent a pixel,
the more colors and shades of gray that
can be represented
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27.
Voice Input
• Voice input is the
process of entering
input by speaking into a
microphone
• Voice recognition is the
computer’s capability of
distinguishing spoken
words
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28.
Voice Input
• Audio input is the process of entering any sound
into the computer
Speech
Music
Sound Effects
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29.
Voice Input
• Music production software allows users to record,
compose, mix, and edit music and sounds
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30.
Video Input
• Video input is the process of capturing full-motion images and
storing them on a computer’s storage medium
Record video on a digital video (DV) camera or use a
video capture card to convert analog signals to digital
Connect the camera to a port on the system unit
Transfer video and images
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32.
Video Input
• A Web cam is a type of digital video camera that
enables a user to:
Capture video and
still images
Send e-mail
messages with
video attachments
Broadcast live
images over the
Internet
Add live images to
instant messages
Make video
telephone calls
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33.
Video Input
• A video conference is a meeting between two or
more geographically separated people
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34.
Scanners and Reading Devices
Flatbed
Pen or Handheld
Sheet-fed
Drum
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36.
Scanners and Reading Devices
• Optical character recognition (OCR) involves reading
characters from ordinary documents
• A turnaround document is a document you return to the
company that creates and sends it
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37.
Scanners and Reading Devices
• Optical mark
recognition (OMR)
reads hand-drawn
marks such as small
circles or rectangles
• An OMR device scans
the documents and
matches the patterns of
light
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38.
Scanners and Reading Devices
• A bar code reader, also
called a bar code
scanner uses laser
beams to read bar
codes
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39.
Scanners and Reading Devices
• RFID (radio frequency identification) uses radio signals to
communicate with a tag placed in or attached to an object
• An RFID reader reads information on the tag via radio waves
• RFID can track:
Inventory
Location of
soldiers
Gauging tire
pressure and
temperature
Employee
wardrobes
Library books
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Airline
baggage
Prepaid tolls
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41.
Scanners and Reading Devices
• Magnetic stripe card readers read the magnetic
stripe on the back of cards such as:
Credit cards
Entertainment cards
Bank cards
Other similar cards
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45.
Biometric Input
hand
geometry
system
iris
recognition
system
fingerprint
reader
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46.
Terminals
• A terminal is a computer that allows users to send data to
and/or receive information from a host computer
A POS terminal
records purchases,
processes
payment, and
updates inventory
An automated
teller machine
(ATM) allows users
to access their
bank accounts
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A DVD kiosk is a
self-service DVD
rental machine
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